fitting them 6x9 focals would all depend on what you have up front.
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I had a set of 16.5 cm focal components powered by a soundstream amp in the doors and I thought that they were enough.
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i would only have added a smallish sub 8 or 10" to the set up as well as upgrading to a better headunit.
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You'll have to give more information on your current set-up.
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If the front is weaker than what you'll have at the rear, you'll be drawing the sound
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(stage) behind you and it'll make for a weird effect.
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